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针对某厂生产O5板的工艺流程(铁水预脱硫→转炉→钢包改质剂→RH→连铸),系统分析各工序及铸坯中T[O]、[N]含量和显微夹杂物的类型、来源、数量及组成。结果表明:铸坯中T[O]为25.67×10-6,[N]为27×10-6,显微夹杂物数量为2.66个/mm2,显微夹杂物类型主要有TiN夹杂、TiO2-FeS夹杂和Al2O3夹杂,其含量分别为30%、24.55%、20.91%。RH破真空后钢水中T[O]、[N]含量偏高,钢中显微夹杂物的数量较多,说明RH真空处理尚有余地;钢中夹杂物上浮去除效果较差,提高钢包顶渣吸附夹杂物的性能是提高钢品质的一个途径;铸坯中显微夹杂物近一半为不规则夹杂物,因此夹杂物充分地液化、聚集、上浮是进一步提高O5板品质的关键。
Aiming at the process of producing O5 plate in a certain plant (hot metal pre-desulfurization → converter → ladle modifier → RH → continuous casting), the contents of T [O], [N] and microscopic inclusions Type, source, quantity and composition. The results show that T [O] is 25.67 × 10-6, [N] is 27 × 10-6, the number of micro-inclusions is 2.66 / mm2. The types of micro-inclusions are TiN inclusions and TiO2- FeS inclusions and Al2O3 inclusions, the contents were 30%, 24.55% and 20.91% respectively. RH after vacuum vacuum molten steel T [O], [N] content is high, the number of micro-inclusions in steel more, there is room for RH vacuum treatment; removal of inclusions in steel is less effective to improve the steel top The performance of slag adsorbing inclusions is one way to improve the quality of steel. Nearly half of the microscopic inclusions in the slab are irregular inclusions. Therefore, the inclusions are fully liquefied, aggregated and floated, which is the key to further improve the quality of O5 slab.